Single-layer single-feed double-frequency circularly polarized microstrip antenna

The invention provides a single-layer single-feed dual-frequency circularly polarized microstrip antenna, which comprises a dielectric substrate, a microstrip patch and a coaxial feed probe, a grounding layer is arranged on one side surface of the dielectric substrate; the microstrip patch is positioned on the other side surface of the dielectric substrate; the surface of the micro-strip patch is cut to form a plurality of rotationally distributed U-shaped slot grooves; the coaxial feed probe penetrates through the dielectric substrate and is connected with the microstrip patch, a coaxial line inner dielectric is arranged between the bottom end of the coaxial feed probe and the grounding layer, and the coaxial line inner dielectric is sleeved with a feed line shielding layer connected with the grounding layer. Different from an existing dual-frequency circularly polarized microstrip antenna, the antenna is simpler in structure, only the single-layer dielectric plate and single-point coaxial ...